keeping niagara particles away from each other

i was just trying to make niagara crowd sim of zombies, in few places the characters are

overlapping one another .i guess i just have to give unform space between the characters can someone help me fix that

You might want to look into PBD (Position Based Dynamics), to that’s the only way I know you can achieve self collision between particles coming from the same emitter
Check out the Niagara map in Content Example project, there should be a a Niagara System that showcases the technique!